scholarly journals Crystal growth, transport phenomena and two-gap superconductivity in the mixed alkali metal (K1−zNaz)xFe2−ySe2 iron selenide

CrystEngComm ◽  
2014 ◽  
Vol 16 (30) ◽  
pp. 6919-6928 ◽  
Author(s):  
Maria Roslova ◽  
Svetoslav Kuzmichev ◽  
Tatiana Kuzmicheva ◽  
Yevgeny Ovchenkov ◽  
Min Liu ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Alkali Metal ◽  
Single Crystals ◽  
Transport Phenomena ◽  
The Self ◽  
Iron Selenide ◽  
Mixed Alkali ◽  
Andreev Spectroscopy

Using the self-flux technique we grew superconducting (K0.7Na0.3)xFe2−ySe2 single crystals; Andreev spectroscopy revealed two anisotropic superconducting gaps.

Synthesis and Characterization of Large Single Crystals of Silicon and Germanium Clathrate-II Compounds and a New Tin Compound with Clathrate Layers

2000 ◽  
Vol 626 ◽  
Author(s):  
Svilen Bobev ◽  
Slavi C. Sevov
Keyword(s):  
Alkali Metal ◽  
Single Crystals ◽  
Alkali Metals ◽  
Measured Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mixed Alkali ◽  
Pauli Paramagnetism ◽  
Silicon And Germanium

ABSTRACTWe have synthesized large single crystals of clathrate-II compounds with frameworks of silicon and germanium by employing mixed alkali metal countercations. The combinations of alkali metals are rationally selected in order to fit the different cages of the clathrate-II structure. This approach leads to the following stoichiometric and fully “stuffed” compounds: Cs8Na16Si136, Cs8Na16Ge136, Rb8Na16Si136 and Rb8Na16Ge136. The structures and the corresponding Si-Si and Ge-Ge distances are elucidated and established with high accuracy from extensive single crystal X-ray diffraction work. The compounds are stoichiometric, metallic, and are very stable at a variety of extreme conditions such as heat, concentrated acids, hydrothermal treatment etc. No evidence was found for vacancies in the silicon and germanium networks or partial occupancies of the alkali metal sites. The stoichiometry of these fully “stuffed” clathrates is consistent with the measured temperature independent Pauli paramagnetism, supported also by the conductivity measurements on single crystals and thermopower measurements on pellets. A new compound with novel clathrate-like structure forms when small and large cations are combined with tin. The new materials, A6Na18Sn46 (A = K, Rb, Cs), are made of clathrate layers and the interlayer space filled with Sn4-tetrahedra and alkali-metal cations. Its formula can be rationalized as A6Na6Sn34 + 3·Na4Sn4 (one clathrate layer and three tin tetrahedra). The compound is stable in air and is being currently tested at other conditions. Detailed measurements of its transport properties are under way.

Structural design of alkali-metal titanates: electrochemical growth of KxTi8O16, Na2+xTi6O13, and Li2+xTi3O7 single crystals with one-dimensional tunnel structures

CrystEngComm ◽  
2019 ◽  
Vol 21 (20) ◽  
pp. 3223-3231 ◽  
Author(s):  
Yusuke Chiba ◽  
Daisuke Koizumi ◽  
Miwa Saito ◽  
Teruki Motohashi
Keyword(s):  
Crystal Growth ◽  
Alkali Metal ◽  
Single Crystals ◽  
Structural Design ◽  
Constant Voltage ◽  
One Dimensional ◽  
Electrochemical Growth

Crystal growth of alkali-metal titanates was achieved by employing constant-voltage electrolysis of molten TiO2/A2MoO4 (A = Li, Na, and K).

Crystal growth of alkali metal ion doped potassium niobate fiber single crystals

2010 ◽  
Vol 32 (7) ◽  
pp. 735-738 ◽  
Author(s):  
H. Kimura ◽  
R. Tanahashi ◽  
H.Y. Zhao ◽  
K. Maiwa ◽  
Z.X. Cheng ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Alkali Metal ◽  
Single Crystals ◽  
Metal Ion ◽  
Potassium Niobate ◽  
Alkali Metal Ion

Preparation of polyethylene oxide single crystals via liquid gating technology and morphology design strategy

2021 ◽  
Vol 77 (5) ◽  
Author(s):  
Shi Li ◽  
Jihe Zhao ◽  
Xiao Wang ◽  
Zhihua Li ◽  
Xuefeng Gui ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystals ◽  
Polyethylene Oxide ◽  
The Self ◽  
Crystallization Time ◽  
Single Crystal Film ◽  
Seeding Method ◽  
Crystal Film ◽  
New Strategy

A novel type of liquid gating technology has been developed to prepare a polyethylene oxide (PEO) single-crystal film, and the crystal growth was observed via atomic force microscopy. The self-seeding method has been widely used in the preparation of polymer single crystals, but the mechanism through which single polymer crystals are formed via the combination of liquid gating technology and the self-seeding method remains unclear. To elucidate the mechanism of this process, a series of experiments were conducted in which a dilute polymer solution was sprayed onto a mica substrate to form a single-crystal film through liquid gating technology to study the effect of the crystallization time on the morphology of a thiol PEO (mPEO-SH) crystal. Based on this research, it was found that liquid gating helps to prevent twinning during crystal growth. The combination of liquid gating and self-seeding technology thus provides a new strategy for polymer single-crystal growth.

Crystal growth and scintillation properties of tube shape-controlled Ce-doped Y3Al5O12 single crystals grown by micro-pulling-down method

2020 ◽  
Vol 13 (12) ◽  
pp. 125503
Author(s):  
Atsushi Kotaki ◽  
Masao Yoshino ◽  
Yuui Yokota ◽  
Takashi Hanada ◽  
Akihiro Yamaji ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Single Crystals ◽  
Tube Shape ◽  
Shape Controlled

scholarly journals Single Crystal Growth and Physical Properties of Pyroxene CoGeO3

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 378
Author(s):  
Li Zhao ◽  
Zhiwei Hu ◽  
Hanjie Guo ◽  
Christoph Geibel ◽  
Hong-Ji Lin ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Crystal Growth ◽  
Physical Properties ◽  
Single Crystal ◽  
Single Crystals ◽  
Magnetic Moments ◽  
Single Crystal Growth ◽  
The Impact

We report on the synthesis and physical properties of cm-sized CoGeO3 single crystals grown in a high pressure mirror furnace at pressures of 80 bar. Direction dependent magnetic susceptibility measurements on our single crystals reveal highly anisotropic magnetic properties that we attribute to the impact of strong single ion anisotropy appearing in this system with TN∼33.5 K. Furthermore, we observe effective magnetic moments that are exceeding the spin only values of the Co ions, which reveals the presence of sizable orbital moments in CoGeO3.

Na1.7Li0.3BaZn7(TeO6)3: The first mixed alkali metal and alkaline earth metal zinc tellurate

2021 ◽  
Vol 123 ◽  
pp. 108363
Author(s):  
Ting Zhang ◽  
Jing-Jing Zheng ◽  
Shi-Chao Cheng ◽  
Jun-Wei Feng ◽  
Chun-Yan Bai
Keyword(s):  
Alkali Metal ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Mixed Alkali

Trends in Rare Earth Thiophosphate Syntheses: Rb3Ln(PS4)2 (Ln = La, Pr, Ce), Rb3-xNaxLn(PS4)2 (Ln = Pr, Ce; x = 0.50, 0.55), and RbEuPS4 Obtained by Molten Flux Crystal Growth

CrystEngComm ◽  
2021 ◽  
Author(s):  
Logan S Breton ◽  
Mark D. Smith ◽  
Hans-Conrad Zur Loye
Keyword(s):  
Rare Earth ◽  
Crystal Growth ◽  
Single Crystals ◽  
Molten Flux

Single crystals of new rubidium rare earth thiophosphates with the formulas Rb3Ln(PS4)2 (Ln = La, Pr, Ce), Rb3-xNaxLn(PS4)2 (Ln = Pr, Ce; x = 0.50, 0.55), and RbEuPS4 were crystallized...

scholarly journals Numerical Analysis of Difficulties of Growing Large-Size Bulk β-Ga2O3 Single Crystals with the Czochralski Method

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
Xia Tang ◽  
Botao Liu ◽  
Yue Yu ◽  
Sheng Liu ◽  
Bing Gao
Keyword(s):  
Crystal Growth ◽  
Single Crystals ◽  
Czochralski Method ◽  
Liquid Interface ◽  
Spiral Growth ◽  
Growth Time ◽  
Large Size ◽  
Crystal Diameter ◽  
Solid Liquid Interface ◽  
Solid Liquid

The difficulties in growing large-size bulk β-Ga2O3 single crystals with the Czochralski method were numerically analyzed. The flow and temperature fields for crystals that were four and six inches in diameter were studied. When the crystal diameter is large and the crucible space becomes small, the flow field near the crystal edge becomes poorly controlled, which results in an unreasonable temperature field, which makes the interface velocity very sensitive to the phase boundary shape. The effect of seed rotation with increasing crystal diameter was also studied. With the increase in crystal diameter, the effect of seed rotation causes more uneven temperature distribution. The difficulty of growing large-size bulk β-Ga2O3 single crystals with the Czochralski method is caused by spiral growth. By using dynamic mesh technology to update the crystal growth interface, the calculation results show that the solid–liquid interface of the four-inch crystal is slightly convex and the center is slightly concave. With the increase of crystal growth time, the symmetry of cylindrical crystal will be broken, which will lead to spiral growth. The numerical results of the six-inch crystal show that the whole solid–liquid interface is concave and unstable, which is not conducive to crystal growth.

Sign in / Sign up

Export Citation Format

Share Document